To further explore what this equation means, consider four sets of identical waves that move in the x direction. A photo is taken of each wave at time ttt and is displayed in the figures below. Rank these sets of waves on the basis of the maximum amplitude of the wave that results from the interference of the two waves in each set. Rank from largest amplitude on the left to smallest amplitude on the right. To rank items as equivalent, overlap them.

see earlier

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as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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